newlib/winsup/cygwin/release/2.8.1

What's new:
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- Allow unprivileged symlink creation in Windows 10 1703 and later.

- New API: reallocarray

- New API: strverscmp, versionsort.


What changed:
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- The XSI form of sigpause, which removes the given signal from the process's
  signal mask, is made available when compiling with _XOPEN_SOURCE or
  _GNU_SOURCE.

Bug Fixes
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- Fix build problem with GCC 6.
  Addresses: https://cygwin.com/ml/cygwin-patches/2017-q2/msg00014.html

- Fix stat.st_blocks for files compressed with CompactOS method.
  Addresses: https://cygwin.com/ml/cygwin-patches/2017-q2/msg00026.html

- Fix extreme lagging during strace in certain scenarios.
  Addresses: https://cygwin.com/ml/cygwin/2017-04/msg00240.html

- Fix unwanted decimal point localization in /proc/loadavg
  Addresses: Reported on IRC.

- Fix ldd potentially looping on non-continuable exception
  Addresses: https://cygwin.com/ml/cygwin-patches/2017-q2/msg00002.html

- Fix buffer overflow problem in wcsxfrm/wcsxfrm_l.
  Addresses: https://cygwin.com/ml/cygwin/2017-05/msg00149.html

- Fix crash if env var name starts with non-ASCII char
  Addresses: https://cygwin.com/ml/cygwin/2017-05/msg00330.html

- Fix return value of lrint{f,l} on x86_64 Cygwin.
  Addresses: https://cygwin.com/ml/cygwin/2017-05/msg00388.html